document.write( "Question 499209: Resturant bill including 20% tip is $180.00, what was the bill before the tip? I don't know how to setup the problem to solve \n" ); document.write( "
Algebra.Com's Answer #337464 by nerdybill(7384)\"\" \"About 
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Resturant bill including 20% tip is $180.00, what was the bill before the tip?
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\n" ); document.write( "Let x = amount ($) before tip
\n" ); document.write( "then
\n" ); document.write( "x + .20x = 180
\n" ); document.write( "x(1+.20) = 180
\n" ); document.write( "x(1.2) = 180
\n" ); document.write( "x = 180/1.2
\n" ); document.write( "x = $150
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